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Check the bulbs in the rear light clusters, I think you will have a double element bulb for side lights & brake lights (there is in my estate) make sure these are ok & in the correct way, I have read of the same problem that you have being caused if the brake light element on the bulb breaks & touches the side light element or vice versa.
If the bulbs are ok check the sockets that they go into for corrosion etc as lighting problems can be caused by a bad connection / earth.
Currently in TTT's garage:
2001 Renault Laguna II 1.9dCi Dynamique Sport Tourer